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= 1/2 * 9/20 = 9/40
1 7/9 : 2 2/3 - 2/5 = 16/9 : 8/3 - 2/5 = 16/9 * 3/8 - 2/5 = 2/3 * 1 - 2/5 =
= 2/3 - 2/5 = 10/15 - 6/15 = 4/15
6 1/6: 1/6 - 2 1/4 : 2 = 37/6 * 6/1 - 9/4 * 1/2 = 37 - 9/8 = 37 - 1 1/8 = 35 7/8